Firearm



GCL 12, 1943- P. H. E.`REHNBERG FIRE ARM Filed April l0, 1959 2Sheets-Shree?I 1 y gg@ .i 3:5155.1555554551 Il. l 541441554551441..551554545, 95144445? Z 'llnlllr N. hm SN dvfm gr. 0r-rj EHK Rehnbefrg ML9M ATTY,

Oct. 12, 1943.

P.v H. E. REHNBERG FIRE ARM Filed April 10, .1959

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Patented Oct. 12, 1943 FIREARM Per Harry Erik Rehnb'erg, Enskede,Sweden, as-

signor to Aktiebolaget Snabb Av r 1938, Stockholm, Sweden, a joint-stockcompany of Sweden Application April 10, 1939, Serial No. 266,976 InSweden April Z3, 1938 4 Claims.

The present invention relates to improvements in those semi-automatic orwholly automatic iire arms. One object of the invention is to produce anautomatic riiie or the like, in which a -gas nozzle is mounted slidablyon the free end of the barrel in such a manner that the bullet, afterhaving left the barrel, has to traverse only a very short distancewithin the gas nozzle.

A further object of the invention is to provide an automatic tire arm inwhich -the elements which serve to reciprocate the breach blockmechanism and their associated springs are mounted in a compact mannerwithin one another...

A still further object of the invention is to provide an automatic iirearm in which the breech block driving mechanism is of simpleconstruction and consists of a limited number of sturdy elements whichoier a lhigh resistance to wear and tear.

Still another object of the invention is to produce an automatic iirearm vwith a breech block driving mechanism, the parts of which-can beeasily dismounted, cleaned and exchanged.

According to the invention, these and other objects are accomplished bythe arrangement and combination of parts set forth in the followingdetailed description, dened in the appendedV claims and illustrativelyexemplified in the accompanying drawings, in which:

Figs. 1 and la are to be taken as a single figure and'constitute alongitudinal section through a rifle, according to the invention, withthe movable parts in the position they assume immediately after firing.

Figs, 2 and 2a, taken together, are a similar longitudinal sectionthrough the rifle with the movable parts in their rear end position, and

Fig. 3 is a longitudinal section through the rear portion, of a modifiedembodiment.

In the drawings, the numeral l indicates the tie stock on which ismounted the breech mem,- ber 2 with the barrel 3. the said barrel beingas usual provided with backsight 4 and foresight 5. Around the free endof the barrel 3 is mounted a hollow cylindrical nozzle 6, into the frontend of which there is screwed an end piece 8 provided with a centralopening 1. The muzzle of the barrel 3 is conically bored. To theunderside of the nozzle 6 is welded a U-shaped sleeve 9 which by meansof a bayonet-joint 9a is connected with a cylindrical member l which isopen at the top of its front portion. A rack l2 having teeth Il issecured to the nozzle within the sleeve 9. The rack I2 is arrangedresiliently in such a way that its rear end i3 is urged somewhat awayfrom the nozzle 6. However, this fend i3 is wedge-shaped and enters, inits rear position, a cam groove H in a bearing l secured to the barrel.Surroundingthe cylindrical member I0 and resting with one 'end on a ring'I6 secured to the member Il! and with the other end of the bearing l5there is mounted a helical lspring I1 which is arranged as a pressurespring. A spindle i8 which extends through the cylindrical member l0 andyis guided for slidable movement therein, is provided at its front endwith teeth ls which cooperate with the teeth H on the rack l2. At itsrear end the cylindrical member I0 is provided with a nut 20 cooperatingwith a buffer a which reduces the shock when the nozzle 6 isflungforward. Within the member I0 and resting against the nut 20 and vaguide shoulder 2| on the spindle I8 there is provided another helicalspring 22 arranged as the 'magazine 26, and are at their rear enddetachably connected with a reciprocable breech block mechanism of anyknown type. A suitable breech block mechanism is described, forinstance, in the British Patent No. 131,350.

The construction of the breech block mechanism does not form part of thepresent invention, but, for the sake of completeness, its principalelements may be brieiiy outlined as follows: The rear ends of the rails25 are connected with an approximately semi-cylindrical member 2l. Insaid member is provided a screw thread 28 which is engaged bya'correspondingly screw threaded projection 30 on the rear p0rtion ofthe breech block 29. The breech block is provided with lugs 3l in theusual way in Mauser rifles, said lugs cooperating with lugs 32 in thebreech member 2. The lugs 3l are provided with projecting iingers 33which serve to withdraw the cartridge shell from the breech member. Theblock 29 may be actuated by means of a knob 34, the arm 35 of which hasbeen shortened a little and curved to the right side of the rifle. Thestriker with lug is indicated by 3G. The striker glides on a guide rail31, which is elongated backward in order to be stable. The striker 36cooperates with a corresponding lug 40 located on the sear lever shownin Figs. 1 and 1a. The cartridge shell 43 still lies in the iiringposition. The nozzle 6 has been pressed forward by the gases behind thebullet, and the teeth II of the rack I2 have-engaged the teeth I9 on thespindle I8. During this procedure the spring II has been compressed andnow tends to move the cylindrical member IIl and the elements connected'therewith backward. However, in order to open the bolt 28 it isnecessary to turn the same, and, as the pin 4I is still in the recess 42and prevents this turn- .ing, the elements will remain in theirpositions until the trigger 38 has been released. When this has takenplace, the semi-cylindrical part 21 is pressed backward by the rails 25.At the beginning of this movement the screw threaded projection 30 onthe block 29 will glide in the screw thread 28 and thus `turn the blocka quarterv of afrevclution in order to release the lugs 3I. At continuedpressure of the spring I'I the breech block 2S will be withdrawn to theposition shown in Fig. 2, the empty cartridgeshell being thrown out inthe usual manner. However, at the end of the rearward stroke of thenozzle, the end I3 of the resilient rack I2 Venters the cam groove I4 inthe bearing I5,

whereby the teeth II ,are lifted oi the teeth I9 of spindle I8. SpindleI8 is thus released and continues to move rearwardly a short distance.

The spring 22, which has been previously compressed, now presses thebreech block 29 forward again. During this procedure a loaded cartridgeM is introduced in a known way to the iring position and the breechblock is locked again in its inner position. The engagement of the endI3 of the rod I2 in the cam groove I4 allows the teeth I9 to passforwardly of the teeth I I. 'Ihe elements now reassume the positionshown in Fig. 1 except the nozzle 5, the elements rigidly connected withthe same, the trigger 38, the lever .39 and the striker which assume thepositions shown in Fig. 2. When the trigger 38 has been pressed backwardagain the new cartridge introduced to the iiring position is fired andthe process is repeated.

In order to make the gun still more safe, there may be provided aprotective cap above the rear part of the breech block and extending tothe end of the path of movement of the breech block, as shown in Fig, 3.

When a protective cap is used it is not necessary to retain the breechblock in its rear position, and therefore the members intended hereformay be omitted. Moreover, by a simple change of the firing mechanism thegun may be made wholly automatic or wholly and semiautomatic.

It is evident that the device may be varied in many respects within thescope of the invention.

Having now described by invention, what I claim as new and desire tosecure by Letters Patent is:

1. In an automatic re arm, the combination with a barrel, having aconically bored muzzle, and a reciprocable breech block mechanism, of a4through said iirst element and gas nozzle slidable on and surroundingthe free end of the barrel, said nozzle including a. from; wall providedwith a central opening in register with the barrel bore, said frontwall, in the rear end position of said nozzle, being disposed directlyadjacent said muzzle, a rst elongated element slidable along said barreland rigid with said nozzle, a spring acting on said barrel and firstelement, respectively, to urge the latter into its rearmost position, asecond elongated element mounted for longitudinal movement periodicallyslidable in unison with and relative to said first element, a latcharranged for longitudinal movement with one of said elements, said latchprojecting yieldingly into the path of the other element, means on saidother element for cooperation with said latch to lock the two elementstogether during the rearward stroke of the nozzle while allowingindependent longitudinal movement of the iirst element during theforward stroke of the nozzle, means connecting the rear end of saidsecond element with said breech block mechanism, means on said barrel todisengage said latch from said cooperating means at the end of therearward stroke of the nozzle, and spring means between the rst andsecond elements to displace said second element in forward directionindependently of said iirst element when said latch has been disengagedfrom said cooperating means."

2. In an automatic re arm, the combination with a barrel, having aconically bored muzzle, and a reciprocable breech block mechanism, of agas nozzle slidable on and surrounding the free end of the barrel, saidnozzle including a front Wall provided with a central opening inregister with the barrel bore, said front wall, in the rear end positionof said nozzle, being disposed directly adjacent said muzzle, a rstelongated element comprising a hollow cylindrical member slidable alongsaid barrel and rigid with said nozzle, a pressure coil springsurrounding said cylindrical member and acting on said member and on thebarrel, respectively, to urge the nozzle into its rearmost position, asecond elongated element comprising a spindle slidably guided in saidcylindrical member, a pressure coil spring surrounding said spindlewithin said cylindrical member and acting on said two elements to urgesaid spindle forward relative to said cylindrical member, a latcharranged for longitudinal movement with one of said elongated elements,said latchprojecting yiedingly into the path of the other elongatedelement, means on said other element for cooperation with said latch tolock the two elements together during the rearward stroke of the nozzlewhile allowing independent longitudinal movement of the cylindricalmember and nozzle during the forward stroke of the latter, meansconnecting the rear end of said spindle with said breech blockmechanism, and means on said barrel to disengage said latch from saidcooperating means at the end of the rearward stroke of the nozzle.

3. An automatic iire arm, as claimed in claim 2, in which said latch isarranged for movement with said cylindrical member and comprises aresilient rack having at its free rear end a toothed portion and awedge-shaped thorn, said cooperating means including a correspondingrack portion on said spindle, and saidlatch disengaging means includinga bearing provided with a cam groove into which said thorn of theresilient rack enters at the end of the rearward stroke of the nozzle todisengage the toothed portion of the resilient rack from the rackportion of the spindle.

4. In an automatic re arm, the combination with a barrel, and areciprocable breech block mechanism, of an elongated hollow elementslidable longitudinally along said barrel, said rst element having anozzle in line with the free end of the barrel, a spring acting on saidbarrel and said rst element respectively to urge the latter into itsrearmost position, a second elongated element mounted for longitudinalmovement through said first element and periodically slidable in unisonwith and relative to said first element, a latch carried on said firstnamed element and projecting yieldingly into the path of the secondelement, means on said second element for cooperation with said latch tlock the two elements together during the rearward stroke of the firstnamed element while allowing independent longitudinal movement of thefirst element during the forward stroke of the latter, means connectingsaid second element with said breech block mechanism, means to disengagesaid latch from said cooperating means at the end of the rearward strokeof the rst element, and spring means between the first and secondelements compressible during rearward movement of said second elementfor displacing the second element in forward direction independently ofsaid rst element when the latch has been disengaged.

PER HARRY ERIK REHNBERG.

